This code system http://hl7.org/fhir/definition-status defines the following codes:

CodeDisplayDefinition
draftDraftThe definition is in the design stage and is not yet considered to be "ready for use"
activeActiveThe definition is considered ready for use
withdrawnWithdrawnThe definition should no longer be used
unknownUnknownThe authoring system does not know which of the status values currently applies for this request. Note: This concept is not to be used for "other" - one of the listed statuses is presumed to apply, it's just not known which one.

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